linux-kernel - Re: [PATCH] doc: rmpsg: update with rpmsg

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Message-ID: <ZXN9mAXUeHopmdiQ@p14s>
Date:   Fri, 8 Dec 2023 13:33:28 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Adrien Leravat <adrien.leravat@...il.com>
Cc:     andersson@...nel.org, corbet@....net,
        linux-remoteproc@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] doc: rmpsg: update with rpmsg_endpoint

On Sun, Dec 03, 2023 at 12:06:04PM -0800, Adrien Leravat wrote:
> It seems the documentation was not updated when `rpmsg_sendto`
> and related switched from `rpmsg_channel` to `rpmsg_endpoint`.
> This change updates the proper calls, text, and the sample.
> 
> Signed-off-by: Adrien Leravat <adrien.leravat@...il.com>
> ---
>  Documentation/staging/rpmsg.rst | 50 ++++++++++++++++++---------------
>  1 file changed, 27 insertions(+), 23 deletions(-)
>

Thanks for the refactoring.  I have applied this patch.

Mathieu

> diff --git a/Documentation/staging/rpmsg.rst b/Documentation/staging/rpmsg.rst
> index 1ce353cb232a..dba3e5f65612 100644
> --- a/Documentation/staging/rpmsg.rst
> +++ b/Documentation/staging/rpmsg.rst
> @@ -68,13 +68,14 @@ User API
>  
>  ::
>  
> -  int rpmsg_send(struct rpmsg_channel *rpdev, void *data, int len);
> +  int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len);
>  
> -sends a message across to the remote processor on a given channel.
> -The caller should specify the channel, the data it wants to send,
> +sends a message across to the remote processor from the given endpoint.
> +The caller should specify the endpoint, the data it wants to send,
>  and its length (in bytes). The message will be sent on the specified
> -channel, i.e. its source and destination address fields will be
> -set to the channel's src and dst addresses.
> +endpoint's channel, i.e. its source and destination address fields will be
> +respectively set to the endpoint's src address and its parent channel
> +dst addresses.
>  
>  In case there are no TX buffers available, the function will block until
>  one becomes available (i.e. until the remote processor consumes
> @@ -87,17 +88,18 @@ Returns 0 on success and an appropriate error value on failure.
>  
>  ::
>  
> -  int rpmsg_sendto(struct rpmsg_channel *rpdev, void *data, int len, u32 dst);
> +  int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
>  
> -sends a message across to the remote processor on a given channel,
> +sends a message across to the remote processor from a given endpoint,
>  to a destination address provided by the caller.
>  
> -The caller should specify the channel, the data it wants to send,
> +The caller should specify the endpoint, the data it wants to send,
>  its length (in bytes), and an explicit destination address.
>  
>  The message will then be sent to the remote processor to which the
> -channel belongs, using the channel's src address, and the user-provided
> -dst address (thus the channel's dst address will be ignored).
> +endpoints's channel belongs, using the endpoints's src address,
> +and the user-provided dst address (thus the channel's dst address
> +will be ignored).
>  
>  In case there are no TX buffers available, the function will block until
>  one becomes available (i.e. until the remote processor consumes
> @@ -110,18 +112,19 @@ Returns 0 on success and an appropriate error value on failure.
>  
>  ::
>  
> -  int rpmsg_send_offchannel(struct rpmsg_channel *rpdev, u32 src, u32 dst,
> +  int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
>  							void *data, int len);
>  
>  
>  sends a message across to the remote processor, using the src and dst
>  addresses provided by the user.
>  
> -The caller should specify the channel, the data it wants to send,
> +The caller should specify the endpoint, the data it wants to send,
>  its length (in bytes), and explicit source and destination addresses.
>  The message will then be sent to the remote processor to which the
> -channel belongs, but the channel's src and dst addresses will be
> -ignored (and the user-provided addresses will be used instead).
> +endpoint's channel belongs, but the endpoint's src and channel dst
> +addresses will be ignored (and the user-provided addresses will
> +be used instead).
>  
>  In case there are no TX buffers available, the function will block until
>  one becomes available (i.e. until the remote processor consumes
> @@ -134,13 +137,14 @@ Returns 0 on success and an appropriate error value on failure.
>  
>  ::
>  
> -  int rpmsg_trysend(struct rpmsg_channel *rpdev, void *data, int len);
> +  int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len);
>  
> -sends a message across to the remote processor on a given channel.
> -The caller should specify the channel, the data it wants to send,
> +sends a message across to the remote processor from a given endpoint.
> +The caller should specify the endpoint, the data it wants to send,
>  and its length (in bytes). The message will be sent on the specified
> -channel, i.e. its source and destination address fields will be
> -set to the channel's src and dst addresses.
> +endpoint's channel, i.e. its source and destination address fields will be
> +respectively set to the endpoint's src address and its parent channel
> +dst addresses.
>  
>  In case there are no TX buffers available, the function will immediately
>  return -ENOMEM without waiting until one becomes available.
> @@ -150,10 +154,10 @@ Returns 0 on success and an appropriate error value on failure.
>  
>  ::
>  
> -  int rpmsg_trysendto(struct rpmsg_channel *rpdev, void *data, int len, u32 dst)
> +  int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
>  
>  
> -sends a message across to the remote processor on a given channel,
> +sends a message across to the remote processor from a given endoint,
>  to a destination address provided by the user.
>  
>  The user should specify the channel, the data it wants to send,
> @@ -171,7 +175,7 @@ Returns 0 on success and an appropriate error value on failure.
>  
>  ::
>  
> -  int rpmsg_trysend_offchannel(struct rpmsg_channel *rpdev, u32 src, u32 dst,
> +  int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
>  							void *data, int len);
>  
>  
> @@ -284,7 +288,7 @@ content to the console.
>  	dev_info(&rpdev->dev, "chnl: 0x%x -> 0x%x\n", rpdev->src, rpdev->dst);
>  
>  	/* send a message on our channel */
> -	err = rpmsg_send(rpdev, "hello!", 6);
> +	err = rpmsg_send(rpdev->ept, "hello!", 6);
>  	if (err) {
>  		pr_err("rpmsg_send failed: %d\n", err);
>  		return err;
> -- 
> 2.43.0
>